Ours was a 5 day trip in the month of March. It is the time when the weather starts to get hotter with each passing day. However, Munnar still makes you feel like you are enjoying the winter with all the fog and misty weather. We stayed at Bracknell Forest resort. A decent hotel, and worth speding money and staying here - atleast for 2 days. The view from the room (Room 205) was just splendid. We were at the top floor - with cardamon plantation surrounding the resort and hilly view from our room (You can check google images.)
We moved to Thekkady on third day. We somehow did not anticipated that there is so much to do at Thekkady. So, we just stayed there for a day and enjoyed Kalaripatu and elephant rides. But I'll recommend you to stay here for 2 - 3 days and explore Periyar National Park, go for safari ride, boat ride, trekking etc. (Search Google for these things ...you can do here) The biodiversity amazes you in every possible way. If you like forests and actvities realted to forest, you'll ceratinly want to spend few days here. We stayed at Coffee route Coffee Bunglow.
We moved to Alleppy on fourth day. Now, there are few options here that you can explore. You can stay for day in boat and ride in backwaters or stay at a nearby hotel. As we were not to fond of staying on boat, we chose to stay at hotel. We arrived at Kondai Lip resort. Resort is surrounded by backwaters from all sides. We arrived at 3 pm and didn't had a chance to enjoy all the boating options there, as we were travelling back the next day. So, if you are planning & choosing this resort, I'll recommed you to keep a day to yourself for enjoying all the boating activities the resort give you. In the evening, we went to beach, through backwaters. You can enjoy the white sands, sunset, collect shells or be amazed by the meeting point of inland waters with sea. I'll encourage you to stay here for atleast 2 days.
The food at all hotels was good quality. However, since I didn't have a tastebud for south Indian food, I didn't enjoyed it much. I was happy with my bread, jam, tea, daal-rice & rotis.
Tip: Collect cards of places, gardens, plantations you visit. Many of these have started providing courier services. So, you can enjoy tea, spices and other souvenir even years after you have visited the place.
If you are planning a Trip to Kerla from other places (other states and cities), I'll recommend you to book your travel (train or air) ticket on your own and book Travel Planners for your trip. These guys will certainly give you better rates and services compared to your local guy. Believe me, these guys saved me 15 - 20K more than what my local tour guys quoted and gave better stay and services.
I believe this helps you guys.